Read Romans 11.
Romans 10 discussed the fact that many Israelites rejected the good news about Christ but, today in chapter 11, Paul was quick to address the fact that not all Jews were in unbelief (v. 1). In verses 2-10, he reminded us that historically the Jewish people lived in unbelief and rebellion against God for most of their history. So the idea that only some of God’s chosen people were actually chosen to have faith in him is not something new. It is how God has always worked, saving a “remnant” who trusted him from the heart (vv. 5-6).
But why did this happen when Jesus came? Wasn’t the promise of Messiah that he would rule over all Israel?
Yes, that was the promise and it will still happen (v.26). The reason it didn’t happen with Jesus’ first coming, however, was God’s desire to save us Gentiles (vv. 11-25). God will still redeem Israel, just as he promised, but not “until the full number of Gentiles has come in (v. 25b). This is all an expression of God’s mercy (v. 32). He hardened Israel, for a time, so that he would save us. The power of this grace overwhelmed Paul in verses 33-36. It caused him to remark on the greatness of God’s wisdom (v. 33a) and how his wisdom is beyond human comprehension (vv. 34-36).
Is this how you respond to doctrines that are hard to understand? Does the doctrine of election or of the Trinity lift your spirit to worship the immense wisdom of God? Or, does it cause you to question and even deny those doctrines because they are hard for us to understand.
God is all-wise and all-knowing, so, are we really surprised that he does things that we find hard to understand? If everything about God were simple and made perfect sense to limited, fallible people like us, then we should be concerned. So let the difficult doctrines of scripture, the ones you find hard to understand or to accept as true, cause you to look to God in awe. His judgments are “unsearchable… and his paths beyond tracing out!”